I would need some AFM data to come up with anything definitive.
However, the normal deal is that you must be compliant both with the OEI approach climb AND the AEO landing climb requirements, both of which are line-in-the-sand WAT limits and not of much relevance to an actual miss in an environment which involves any obstacles of note (that is to say, you must always be not more than the WAT limits). In this latter case - where you are concerned with a "normal" ops engineering missed approach calculation and procedure - that, usually, will be predicated on an OEI sequence in a manner not overly dissimilar to a takeoff escape procedure. The fact that, near invariably, all motors will be turning and burning is just money in the bank for you, as Captain Speaking.
Quite a few folks confuse the line-in-the-sand nature of WAT limits (which give you a fighting chance of getting some air between you and the earth spheroid) and a design procedure matched to a particular runway (which should give you a very good chance of surviving the episode - often at a quite significant weight penalty compared to the WAT limit). For references to this stuff, have a looksee through Part 25 and Part 121 for starters.